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Please help me.

Question

I am the owner of a windows PC the most recent ones..I also linked my pc and my windows phone together with my microsoft account. A while back last year , my phone was stolen & my pc broke. I just recently got it fixed, and can't access my account
due to whoever had my phone has changed my password and the recovery information...(as I saw when I went to reset my password). Am I just a lost cause at this point? The account that I can't access is the only admin on my newly fixed PC , should I just reset
it to factory settings? Since I'm unable to access the admin account, is that possible still & can I make a backup with the files from my lost admin account?